<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <!-- v-on:事件名="表达式或方法" -->
        <button v-on:click="add">+</button>
        <span >{{num}}</span>
        <button v-on:click="sub">-</button>
    </div>
    <script src="./node_modules/vue/dist/vue.js"></script>
    <script>
        let vm=new Vue({
            el:"#app",
            data:{
                num:107
            },
            // 定义实例上面的方法
            methods:{
                add:function(){
                    // 数据变，视图变
                    this.num+=1;
                },
                sub:function(){
                    this.num-=1;
                }
            }


        })



    </script>


</body>
</html>